{
  "manageEntity": {
    "action": "Save",
    "entityId": "66966406",
    "entityType": "Track",
    "nonce": "0x3030e023ddd4838e3a7e8bd16e1c2daf8be2bdcb4edd1ba57b4c6148c182124b",
    "signature": "0xaa63b671702748ef021a2f520794e7a1a702862b6aed36befb6da6879ccc0bf508fae2ed689931af8efebc2081cb6fdf385e38fbe3d387a5cef18f0b4a0245111b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}